Backfire release



l N V E N TOR Fran/o 0. OhrLstLan/ A TTORNE Y Patented Jan. 1, 1935 i UNITED STATES PATENT OFFICE BACKFIRE RELEASE Frank T. Christian, Elmira, N. Y., assignor to Eclipse Machine Company, Elmira, N. Y., a corporation of New York Application November 30, 1931, Serial No. 578,180

8 Claims. (Cl. 290-48) This invention relates to a back-fire release arranged to engage a contact 21 connected to the for internal combustion engines and more parlead 12. It will thus be seen that closure of the ticularly to a device for temporarily rendering switch 9 when the parts are in normal position inoperative an automatic starting mechanism will cause actuation of solenoid 8 to close the for internal combustion engines in case the enstarter switch 5. 5

gine back-fires. According to the present invention means are It has been found desirable in connection with provided for opening contacts 19, 21 of the conautomatic starting mechanism for internal comtrol circuit in case of backward rotation of the bustion engines to provide means for preventing engine and for maintaining said contacts open engagement of the starting mechanism while the for a predetermined time after backward rota- 10 engine is rotating backward as in case of backtion ceases. For this purpose, a movable thrust fire. It is further desirable to delay the reenmember 22 is arranged in position to engage the gagement of the starting mechanism until the thermostatic element 17, and is mounted a engine has ceased rocking and has come comflexible diaphragm 23 which is subjected, as inpletely to rest, in order to prevent engagement dicated, to the pressure within an element 24 of 16 0f the starting mechanism While the engine is the fuel intake system of the engine such as the rotating or rocking backward. intake manifold. The member 22 is further pro- It is an object of the present invention to provided with an electrical contact 25 adapted to vide a novel device for rendering an automatic engage a contact 26 on the thermostatic element r i m hanism inoperative as a result of 17, and since the member 22 is groundedon the 20 backward rotation of the engine. intake manifold, as indicated at 27, closure of It is another object 30 p ov de suc 9- de ic contacts 25, 26 causes a circuit to be established which P i a time delay after Such backward from the lead 11 through the thermostatic elerotation ceases before reactuation of the startment 1'! to the ground whereby the the1most..,.

ing mechanism. element is heated. The thermostatic element is 25 It is a fu t e ject to provide Such a device arranged so that an increase of temperature which is ap d for se with commercial forms thereof causes control contact 19 to move away of automatic starting mechanism or with known from the fixed ontact 21, forms f r l yp r in switches- In the operation of the device, closure of the Further objects and advantages will be 4 switch 9 will under normal conditio use ac- 3o 1 parent to those skilled in this art from the follow-- tuatlon of the solenoid 8 to close starting ing description taken in connection with the acwit h 5 as ab v t forth H w -var, if the encomp nyin dr win in whi h h figure i a gine should back-fire, pressure the intake semi-d a showing 01 a Preferred f01111 manifold 24 causes the diaphragm 23 to raise of the invention. the thrust member 22, opening control contacts 35 In the drawing there is illustrated an electri- 9 21 and closing m heater t t 25, 26 cal starting System internal combustion whereby the thermostatic element 17 is immeengine, not illustrated, mpris ng a battery 1 diately heated by the current traversing contacts grounded at 2 and connected by a lead 3 to an 25 2 t t ground t 27 automatic starting mechanism indicated generw t backward t t of t engine 40 y y numeral The automatic 415931118 ceases, the pressure in the intake manifold 24 is mechanism includes a starting switch 5 which is dissipated, allgwing t diaphragm 23 and th t connected by a lead 6 t0 Starting motor SM member 22 to return to their normal positions. w ich is g 'cu d d at whereby closure 01 the The thermostatic element 17, will, however, not

switch 5 completes the starti circuit and causes close control contacts 19, 21 until said element 45 cranking of the ine. has cooled down, thereby introducing a time de- The switch 5 is adapted to be operated magnetlay for the reactuation of the starting switch ically by suitable means such as a solenoid 8 in order to ensure that the engine comes comwhich is actuated by a control circuit including a pletely to rest before such reactuation.

5 0 battery switch 9 which may also be the ignition Although but one embodiment of the invenswitch of the engine, leads 11, 12 and 13, contion has been shown and described in detail, it

tacts 14, spring strip 15, and ground 16. Leads will be understood that various other embodi- 11 and 12 are normally connected by means of a ments are possible and certain changes may be thermostatic element 17 connected at 18 to the made in the construction and arrangement of' lead 11, and havingacontact 19 at its opposite end the parts without departing from the spirit of 5 the invenflon a seem the claims appendedhereto.

t is claimed is:-

, 1. Sta Man' for internal combustion engines including a eticaily operated starting switch, a control circuit for said starting return of said opening means to normal position,

2. Starting mechanism for internal combustion engines including a magnetically operated starting switch, a control circuit for said start-, ing switch including a pair of contacts, means responsive to backward rotation of the engine for opening said contacts, and the:mostatic means actuated by said opening means for deg closure of the contacts for a predetered time after return of said opening means to normal position.

3. In combination with an internal combustion engine having a fuel intake system, an electrical stg systemtherefor including a motor and a switch, manually controlliable in for closing said starting switch, means rve to pressure in the fuel intake ,1 1 tor rendering said closing means inoperative, and thermostatic means for delaying the recperaticn of said closing means for a predeteed time enter the dissipation of said press. In combination with an internal combustion engine having a fuel intake system, an electricai s Y0. wstem therefor, including a motor and a starting switch, magnetic operating means for the starting switch, manually controllable contact no means for energizing said magnetic means, means responsive to pressure in the fuel intake system for rendering said energizing means inoperative, and theremostatic means activated by the pressure responsive means for delaying the reoperation of said energizing means for a predeteed time after the dissipation of said pres- 5. In combination with an internal combustion engine having a fuel intake system, an electrical start system therefor including a magnetic starting switch relay, a control circuit for said y inclu a thermostatic element, a

movable contact ced thereby, and a fixed we, by the movable confor closing said heater contacts tact and means responsive to pressure in the intake system of the engine for'causingthe thermostatic element tacts.

6. In combination with an internal combustion engine having a fuel intake system, an electrical starting system therefor including a magnetic starting switch relay, a control circuit for said relay including a thermostatic element, a movable contact carried thereby, and a fixed contact normally engaged by the movable contact and means responsive to pressure in the intake system of the engine for opening said contacts and causing the thermostatic element to be heated mostatic element including a contact carried thereby, a movable element having a contact arranged to cooperate with the heater contact and complete the heater circuit, and means responsive'to pressure in the intake system of the engine for closing said heater contacts.

to be heated to open said con- '8. In combination with an internal combustion engine having a fuel intake system, an electrical starting system therefor including a magnetic starting switch relay, a control circuit for said relay including a thermostatic element, a movable contact carried thereby, and a fixed contact normally engaged by the movable contact,

said thermostatic element being arranged to.

open said control contacts responsive to a rise in temperature, a heater circuit for the thermostatic element including a contact carried thereby, a movable element having a contact arranged to cooperate with the heater contact and complete the heater circuit, and means responsiveto pressure in the intake system of the engine and opening said control circuit contacts.

FRANK T. CHRISTIAN. 

